Enge, H. A., Russel, W. M., & Richards, J. A. (1973). Introduction to atomic physics (World student series ed.). Addison - Wesley.

Enge, Harald A., Wehr M. Russel, and James A. Richards. Introduction to Atomic Physics. World student series ed. London: Addison - Wesley, 1973.

Enge, Harald A., et al. Introduction to Atomic Physics. World student series ed. Addison - Wesley, 1973.